Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 43 for “"Concentration Polarization"”.
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Nonlinear ion concentration polarization : fundamentals and applications
… in a variety of electrochemical systems. Ion concentration polarization (ICP) is an ion transport phenomenon that occurs when ions selectively pass through IEMs. Recently, ICP has drawn renewed attention from physicists and engineers, due to its importance in understanding various …
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Recycling and Regeneration of Spent Perfusion Media via Ion Concentration Polarization
… ammonia and lactate—from spent media using ion concentration polarization. Building on this foundation, a scalable millifluidic system was developed to enable higher-throughput waste removal. We characterized the impact of media recycling upon batch and perfusion cell cultures. We devised a …
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Monitoring, modeling, and controlling membrane fouling and concentration polarization in reverse osmosis systems
… Despite these advantages, membrane fouling and concentration polarization (CP) remain as the key obstacles, diminishing membrane performance and necessitating frequent maintenance and cleaning. Membrane fouling stems from the deposition and accumulation of foulants, including colloids, inorganic …
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Active transport and concentration of analytes in microfluidic paper based analytical devices using ion concentration polarization
… fully wet. In this work, active transport and concentration of analytes in fully wet paper-based assays is demonstrated by leveraging ion concentration polarization (ICP). The efficacy of ICP-inducing µPADs is demonstrated through transporting and concentrating dye, fluorescein and …
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Electrochemical neuromodulation using electrodes modified with ion-selective materials, based on the physical process of ion-concentration polarization
… Its principle of operation is based on ion-concentration polarization (ICP) generated by polarization of electrodes covered with ion-selective membranes (ISMs). In order to optimize this modality in terms of clinical effect and safety, we require a more fundamental understanding of the …
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Effects of Magnetically Induced Micro-mixing on Nanofiltration Performance
… non-aqueous solutions. NF membranes suffer from concentration polarization leading to membrane fouling thus compromised membrane performance. Magnetically responsive nanofiltration (NF) membranes functionalized with superparamagnetic nanoparticles (SPNs) attached to the chain ends of grafted …
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Instigating buoyancy driven convection to improve membrane distillation performance
… of treating complicated wastewaters with high concentrations of dissolved solids. However, temperature polarization and concentration polarization reduce its distillate production and impede its industrial adoption. Surprisingly, no prior work has considered that temperature and concentration …
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CFD simulation of polarization phenomena in direct contact membrane distillation systems
… limit. Studies have shown that temperature and concentration polarization are the two crucial factors affecting DCMD performance in the treatment of hypersaline brines. Temperature polarization refers to a reduction in the transmembrane temperature difference due to heat transfer through the …
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Nonlinear electrokinetic transport and its applications under combined AC and DC fields in micro/nanofluidic interface devices
… important and complex phenomenon among them is concentration polarization. In this thesis, we provide new physical insights in micro/nanofluidic interface devices on the application of AC and DC electric fields. By performing detailed numerical simulations based on coupled Poisson, …
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Genetic Algorithm Based Optimization of Baffle Positions in a Forward Osmosis Draw Channel
… in conjunction with this technology, internal concentration polarization (ICP), a flow-entrainment effect occurring within such membranes, is a significant if not dominant source of overall osmotic pressure loss across the membrane. Accurate modeling of ICP effects is therefore very critical …
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Process Engineering Characteristics of the Hollow Fiber Ultrafiltration of Skimmilk
… pressure, flow rate, temperature and feed concentration and the major measured variable was permeate flux (J). Physical properties such as density, viscosity and protein content of the retentate were experimentally determined while diffusivity was estimated from literature values. The …
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A mechanistic study on the coupled organic and colloidal fouling of nanofiltration membranes
… diffusion due to interactions between solute concentration polarization (CP) layers, and changes in colloid surface properties due to organic adsorption. Additionally, a modified composite cell-model is developed to incorporate the structural differences of a merged, combined fouling layer. …
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A study on organic fouling of reverse osmosis membrane
… RO membrane channel, where it was found that concentration polarization grew exponentially along the channel. These possible variables were incorporate into a model to simulate alginate fouling development in a RO membrane channel.
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Electrokinetic trapping of biomolecules : novel nanofluidic devices for proteomic applications
… nanofluidic concentrator, utilizing the unique concentration polarization effect of sub 50 nm nanofluidic filters. With the distinct ionic and molecular interaction at the nanoscale, nanofluidic systems can potentially outperform current sample preparation and molecular detection techniques. …
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Gate potential control of nanofluidic devices
… this effect. We could increase or decrease the concentration rate of the device by increasing or decreasing the surface charge potential (-potential) on the walls of the nanochannels. An increased -potential enhances the electrokinetic effects caused by electrical double layer. Which in turn …
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Microfluidic engineering of water purification
… (ED), ii) techno-economic analysis of ion concentration polarization (ICP) desalination for high salinity brine treatment, and iii) development of electrocoagulation (EC) - ion concentration polarization (ICP) desalination hybrid that removes dissolved ions and non-ionic contaminants from …
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A Numerical Model for Flux Decline During the Crossflow Ultrafiltration of Colloidal Suspensions
… was developed to predict the flux decline due to concentration polarization during crossflow ultrafiltration. An iterative algorithm was employed to predict the amount of flux decline for each finite time interval until the true steady-state permeate flux is established. For model verification, …
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An Assessment of Community-Scale Electrodialysis Desalination Systems and Improved Scale Mitigation through Pulsed Operation
… through membranes results in the formation of concentration polarization (CP) near membrane surfaces which worsens membrane scaling and energy dissipation in the process. The application of a non-stationary pulsed electric field can be an effective approach for suppressing CP; however, the …
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Static Mixing Spacers for Spiral Wound Modules
… and to enhance mass transfer rates by reducing concentration polarization. Most spacers possess a ladder or mesh structure and rely on the generation of turbulence and eddies to enhance mass transfer. The literature contains numerous experimental and theoretical studies of how pressure drop and …
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Expanding the Capabilities of Paper Spray Mass Spectrometry: High-Throughput Drug Screening and On-Paper Electrokinetic Stacking
… field-amplified sample stacking and faradaic ion concentration polarization into paper-based MS ionization cartridges. Chapter 5 presents mathematical modeling to complement the experimental work, offering a theoretical framework for understanding system behavior. Chapter 6 demonstrates practical …
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